CN112431601A - Shield cutter head suitable for soft and hard composite stratum and tunneling method - Google Patents
Shield cutter head suitable for soft and hard composite stratum and tunneling method Download PDFInfo
- Publication number
- CN112431601A CN112431601A CN202110007563.3A CN202110007563A CN112431601A CN 112431601 A CN112431601 A CN 112431601A CN 202110007563 A CN202110007563 A CN 202110007563A CN 112431601 A CN112431601 A CN 112431601A
- Authority
- CN
- China
- Prior art keywords
- cutter
- hob
- knife
- shield
- stratum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002131 composite material Substances 0.000 title claims abstract description 45
- 230000005641 tunneling Effects 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000002689 soil Substances 0.000 claims abstract description 38
- 239000006260 foam Substances 0.000 claims abstract description 32
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 238000005299 abrasion Methods 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 6
- 239000011435 rock Substances 0.000 claims description 27
- 230000008569 process Effects 0.000 claims description 12
- 239000000956 alloy Substances 0.000 claims description 8
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 230000035515 penetration Effects 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 238000005755 formation reaction Methods 0.000 claims 1
- 230000031877 prophase Effects 0.000 claims 1
- 239000003607 modifier Substances 0.000 abstract description 3
- 239000007921 spray Substances 0.000 abstract 1
- 239000002893 slag Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 7
- 238000010276 construction Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/08—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0642—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield having means for additional processing at the front end
- E21D9/0678—Adding additives, e.g. chemical compositions, to the slurry or the cuttings
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The shield cutter head comprises a shield cutter head (1), a cross-shaped main cutter beam (2), an auxiliary cutter beam (3), a central toothed cutter (4), a front hob (5), a cutter (6), an edge hob (7), an edge scraper (8), a fixed toothed cutter (9), a foam nozzle (10), an abrasion detection cutter (11), an abrasion-resistant steel plate (12) and the like. The cross-shaped main tool beam consists of a first tool beam, a third tool beam, a fifth tool beam and a seventh tool beam, and the auxiliary tool beam consists of a second tool beam, a fourth tool beam, a sixth tool beam and an eighth tool beam. The method comprises the steps of determining the starting torque of a hob, selecting and setting the starting torque as the starting torque of the hob of the soft soil stratum, starting a foam system to spray a foam modifier, and pushing forward a tunneling face rock-soil body by a shield. The cutter head opening rate of the invention reaches 43%, and the invention is particularly suitable for the tunneling of a typical gravel-argillaceous siltstone composite stratum, and reduces the risk of cutter head mud pasting.
Description
Technical Field
The invention relates to a shield cutter head suitable for soft and hard composite strata and a tunneling method, and belongs to the technical field of tunneling machinery.
Background
With the rapid development of economy in China, the development requirement of urban underground space is increasing day by day, and a large number of urban tunnel projects are produced at the same time. The shield construction method has the advantages of high construction efficiency (the integrated construction of excavation and support can be realized), good tunnel forming, small influence on the surrounding environment and the like, and is more and more widely used in urban tunnel excavation. However, when a soft-hard composite formation (such as a typical soft-lower-hard composite formation of Nanchang upper sand layer-lower argillaceous siltstone) is encountered, various problems are often induced due to great differences in formation conditions, and the following are typical: when the disc cutter enters a hard rock stratum from a soft soil stratum, cutter knocking is easily caused due to large difference of rigidity of stratum rock and soil bodies, and the cutter ring is cracked and the cutter shaft is damaged seriously; the hob cutters in rock-soil bodies in different stratums have different starting torques, and the hob cutters are difficult to rotate when entering soft soil stratums from hard rock stratums, so that string grinding and the like of the hob cutters are caused; the cutting knife or the conventional disc cutter can not be adopted singly to realize the high-efficiency tunneling in the composite stratum. In addition, the shield also has the problems of stability of the face in front of the cutter head, slag discharging efficiency and the like when the shield tunnels in the soft and hard composite stratum. Therefore, a shield cutter head and a working method which can be suitable for soft and hard composite strata are needed to be provided, so that the cutter changing times in the tunneling process are reduced, the slag tapping efficiency is improved, and the safe and efficient tunneling of the shield is ensured.
The publication number CN104060995A discloses a shield cutter head structure for mutually invading composite rock strata with uneven hardness, which comprises a heavy cutter head, a double-edged central hob, a single-edged front hob, a single-edged peripheral hob, an auxiliary cutter and the like; the auxiliary knife comprises a front toothed knife, a shovel knife and a protection knife. The influence of the starting torque of the hob on the shield tunneling efficiency is not considered in the shield cutterhead structure for mutually invading the composite rock stratum with uneven hardness, namely: when the starting torque is large, the conventional hob cutter cannot rotate easily to induce string grinding due to insufficient friction force provided when the conventional hob cutter enters a soft soil (gravel) stratum from a hard rock stratum; when the starting torque is adjusted too small, the integral rigidity of the hob is reduced, the impact force on the variable rigidity position of the hard rock stratum and the soft and hard composite interface is large, and the hob is easy to loosen and even to be damaged. In addition, the opening rate of the cutter head in the patent is 20% -30%, and when the tunneling stratum is a argillaceous siltstone stratum with high content of sticky particles, the smooth entering of muck into a soil bin cannot be guaranteed, so that mud cake formation of the cutter head is induced.
Disclosure of Invention
Aiming at the main defects of the prior art, the invention provides a shield cutter head suitable for soft and hard composite strata and a tunneling method.
The shield cutter head suitable for the soft and hard composite stratum comprises a shield cutter head, a cross-shaped main cutter beam, an auxiliary cutter beam, a central toothed cutter, a front hob, a cutter, an edge hob, an edge scraper, a fixed toothed cutter, a foam nozzle, a wear detection cutter, a wear-resistant steel plate and other TBM parts.
Four Y-shaped auxiliary cutter beams are distributed on the diagonal line between the cross-shaped main cutter beams, and the cross-shaped main cutter beams and the auxiliary cutter beams form a bearing structure of the shield cutter head; the cross-shaped main tool beam consists of a first tool beam, a third tool beam, a fifth tool beam and a seventh tool beam, and the auxiliary tool beam consists of a second tool beam, a fourth tool beam, a sixth tool beam and an eighth tool beam.
The central part of the cross-shaped main knife beam is provided with 8 central serrated knives side by side; 20 17-inch front-side hobs are mounted on the cross-shaped main cutter beam, and 5 hobs are uniformly mounted on each main cutter beam; cutters are respectively arranged in front of and behind the front hob rolling trace, and the number of the cutters is 56, and the cutters are distributed and installed on two sides of the cross-shaped main cutter beam; 6 foam nozzles are arranged on the beams of the cross-shaped main knife beam and the auxiliary knife beam.
The auxiliary knife beam is of a Y-shaped structure with a Y-shaped opening facing outwards, and 37 fixed serrated knives are arranged on the auxiliary knife beam; and 7 with 17 inch edge hobs; the end part of the cross-shaped main cutter beam is provided with 8 pairs of edge scrapers with the cutter height of 145 mm; and a wear detection knife is arranged on one auxiliary knife beam and used for monitoring the wear of the knife in real time.
The height of the central toothed cutter is 175mm, and the distance between the cutters is 90 mm; the central serrated knife can effectively reduce the large torque of the conventional fishtail knife under the similar stratum conditions, thereby reducing the shield energy consumption and improving the tunneling efficiency.
The height of the front hob is 175mm, and the distance between the hobs is 100 mm; the front hob is a specially-made high-hardness columnar inserted hob.
The columnar inserted hob is composed of a columnar inserted hob and alloy columnar teeth; the columnar inserted hob is of a circular structure, and a plurality of alloy columnar teeth with the same height are uniformly inserted at the periphery of the outer edge of the columnar inserted hob.
The height of the cutter is 140mm, and the distance between the cutters is 150 mm; the cutter rolls hard rock by a hob on the front side and combines the comprehensive action of cutting soft soil by the cutter, so that the efficient tunneling of the shield in a soft-hard composite stratum is ensured; 56 cutters are arranged and distributed as follows: 24 cutters are arranged on the third cutter beam and the seventh cutter beam at equal intervals from inside to outside in the radial direction; the central parts of the first knife beam and the fifth knife beam are provided with the central toothed cutters, so that 4 cutters are arranged at equal intervals from inside to outside in the radial direction; the outer side 2 is closely arranged with 24 cutters; and 2 cutters, namely 8 cutters, are symmetrically arranged at the central parts of the second cutter beam, the fourth cutter beam, the sixth cutter beam and the eighth cutter beam of the auxiliary cutter beam respectively.
And the efficient tunneling in the composite stratum is realized through the rolling-cutting combined action of the front hob and the cutter. When the tunnel is tunneled in a hard rock stratum, the single-cycle penetration is low, the tunneling rate is mainly controlled by rolling and breaking rock by a front columnar inserted hob, the tunnel face is cut and removed by the aid of a cutter to break rock soil slag, and the rock soil slag enters a soil bin through an opening of a cutter disc; when the tunneling is carried out on a weak stratum, as for a typical gravel stratum, the single-cycle penetration degree is high, the sand cutting effect of the cutter is fully adjusted, the muck can be effectively cut and removed, and the tunneling of each cycle can be completed.
Fixed serrated knife and edge hobbing cutter distribute on four vice sword roof beams, fixed serrated knife symmetrical arrangement is in vice sword roof beam and blade disc edge, wherein: 7 fixed serrated cutters are symmetrically arranged on the second cutter beam and the sixth cutter beam respectively; the fourth knife beam and the eighth knife beam are provided with 2 foam nozzles and 1 abrasion detection knife, the fixed serrated knife at the position is cancelled, the rest positions are the same as the second knife beam and the fourth knife beam in arrangement, the fourth knife beam is provided with 6 fixed serrated knives, and the eighth knife beam is provided with 5 fixed serrated knives; the edge of the cutter head is provided with fixed serrated knives 12 at equal intervals; a total of 37 fixed-tooth knives are arranged.
7 edge hobs are symmetrically arranged at the 4 auxiliary cutter beams close to the edge of the cutter head, wherein 2 hobs are symmetrically arranged at the second cutter beam, the sixth cutter beam and the eighth cutter beam respectively, and 1 hob is arranged at the fourth cutter beam; and the overcutting serrated knives are arranged at the symmetrical positions and are used for effectively controlling the overcutting amount of the soft and hard composite stratum.
The foam nozzles are arranged and distributed as follows: 1 foam nozzle is respectively and symmetrically arranged at the two sides of a central serrated knife on a third knife beam 3 of the cross-shaped main knife beam, and 1 foam nozzle is arranged at the end part of the outer edge of the third knife beam; 1 foam nozzle is arranged on the fourth knife beam of the auxiliary knife beam, and 2 foam nozzles are arranged on the eighth knife beam.
A tunneling method of a shield cutter head suitable for soft and hard composite strata comprises the following steps:
(1) and determining the soil layer distribution condition and the specific physical and mechanical property index in the process of the shield penetrating through the soft and hard composite stratum based on the specific geological survey data in the early stage of the engineering.
(2) The starting torque of the hob is determined according to the stratum crossing characteristics, the set value of the hob starting torque is not suitable to be larger than 20Nm in the process of excavating the sandy gravel stratum, and the set value of the hob starting torque is preferably in the range of 25-40Nm in the process of excavating the hard rock stratum such as argillaceous siltstone and the like.
(3) When the composite stratum with upper soft and lower hard exists in the crossing stratum, the hob starting torque of the soft soil stratum is selected and set.
(4) And starting a foam system, and spraying a foam modifier to the front of the cutter head through a foam nozzle.
(5) And starting the shield cutter head to rotate, starting the spiral conveyor and starting a propulsion mode, and enabling the shield to push forward the tunneling tunnel face rock-soil body.
The physical and mechanical property indexes of the body comprise rock stratum saturated uniaxial compressive strength UCS, a rock integrity coefficient RQD value, a sand stratum actual measurement standard penetration average hammering number N, particle grading, clay content, cohesive force c, internal friction angle phi and other important parameters.
The invention has the beneficial effects that the hob starting torque suitable for the soft soil stratum is set in advance, so that the hob can be ensured to rotate effectively when the hob is driven in the soft soil stratum, and the string grinding of the hob ring of the hob is prevented; when the hob repeatedly rolls and cuts the rock-soil body in the soft and hard composite stratum, the alloy column teeth on the outer side of the hob ring can play a role in protecting the hob ring and improving the wear resistance, and the disc hob is prevented from being knocked or seriously worn when repeatedly passing through the interface of the soft and hard rock stratum; in addition, 6 foam nozzles are arranged on the cutter head, so that a foaming agent can be added in real time according to the slag discharge condition and the properties of slag soil, the abrasion of the cutter is reduced through the improvement of the slag soil, the sludge of the cutter head is avoided, the slag discharge effect and the stability of the tunnel face are ensured, and the tunneling efficiency of the shield in the composite stratum is improved.
The front hob and the edge hob adopted by the invention are both specially-made columnar inserted hob, and when the high-hardness alloy columnar inserted hob is tunneled in a rock stratum, on one hand, the rock breaking efficiency of the hob is improved, and on the other hand, the hob ring is protected from serious abrasion; when a soft and hard composite stratum is tunneled and a hob rolls a soft and hard transition interface, the hob ring bears impact force generated by huge rigidity difference of the stratum, and the columnar insert improves the impact resistance of the hob ring to a greater extent, thereby effectively avoiding the bad condition of colliding with a knife and even damaging the hob ring; when entering a soft stratum, the cylindrical insert teeth and the face rock-soil body are embedded and bitten due to the fact that the cylindrical insert teeth and the face rock-soil body are in the rolling process, the hob can roll the face rock-soil body easily due to the rotation of the whole cutter head under the effect of the same starting torque, and therefore eccentric wear of a hob cutter ring caused by the fact that the hob is stuck or the friction force between the hob and the face cannot normally rotate enough is effectively avoided, the tool changing frequency is reduced, and the tunneling efficiency is improved.
The opening ratio of the cutter head reaches 43 percent, which is far more than that of the similar cutter head by 20 to 30 percent. The opening rate of 43 percent is particularly suitable for typical gravel-argillaceous siltstone composite stratum, and because the lower hard rock stratum is argillaceous siltstone, the content of the clay is extremely high, and the produced slag has high cohesive force, large caking and difficult flowing. The opening rate of 43% sets up and can effectively guarantee that the ground body that the face was cut off in the front of the blade disc gets into the soil storehouse, and then is discharged by screw conveyer, has reduced the risk of blade disc mud.
The tunneling cutterhead device is simple in structure, simple and convenient in processing of used parts, mature in auxiliary facility technology and high in feasibility.
Drawings
FIG. 1 is a schematic plan view of the cutter head;
FIG. 2 is a schematic view of a cutting ring of an insert hob in the cutterhead;
FIG. 3 is a schematic flow diagram of the operation of the cutterhead;
in the figure, 1 is a shield cutter head; 2 is a cross-shaped main cutter beam; 3 is an auxiliary knife beam; 4 is a central serrated knife; 5 is a front hob; 5-1 is the cutting edge of the inserted hob; 5-2 is alloy column teeth; 6 is a cutter; 7 is an edge hob; 8 is an edge scraper; 9 is a fixed serrated knife; 10 is a foam nozzle; 11 is a wear detection knife; 12 is a wear-resistant steel plate.
Detailed Description
As shown in fig. 1 and 2, the shield cutter head suitable for soft and hard composite strata of the present embodiment mainly comprises a shield cutter head 1, a cross main cutter beam 2, an auxiliary cutter beam 3, a central tooth cutter 4, a front hob 5, an inserted hob cutting edge 5-1, an alloy columnar tooth 5-2, a cutter 6, an edge hob 7, an edge scraper 8, a fixed tooth cutter 9, an overexcavation tooth cutter 9-1, a foam nozzle 10, a wear detection cutter 11, a wear-resistant steel plate 12 and other necessary components which are not listed.
The shield cutter head suitable for the soft and hard composite stratum has the following main working principle:
the main bearing structure of the shield cutter head 1 is formed by a cross main cutter beam 2 and an auxiliary cutter beam 3.
The central tooth cutter 4 with the cutter height of 175mm is arranged at the central part of the cross-shaped main cutter beam 1 by 8, the cutter spacing is set to be 90mm, and the large torque of the conventional fishtail cutter under the similar stratum condition can be effectively reduced, so that the shield energy consumption is reduced, and the tunneling efficiency is improved.
20 17-inch front hobs 5 are arranged on the cross main cutter beam 2, the height of each hob is 175mm, and the distance between the hobs is 100 mm; cutters 6 are respectively arranged in front of and behind the rolling trace of the front-face hob 5, the total number of the cutters is 56, the cutter height is 140mm, the cutter spacing is 150mm, and the shield is guaranteed to be efficiently tunneled in a soft and hard composite stratum through the comprehensive effect of rolling hard rock by the front-face hob 5 and cutting soft soil by combining the cutters 6.
22 fixed tooth cutters 9 are arranged on the auxiliary cutter beam 3 to play a role of assisting in cutting rock and soil mass; and 7 17-inch edge hobs 7 are arranged on the auxiliary cutter beam 3 and are used for crushing rock and soil mass at the edge of the cutter head to form an effective overexcavation gap.
The end part of the main cutter beam 2 is provided with 8 pairs of edge scrapers 8 with the cutter height of 145mm, and the front hob 5 and the cutter 6 are assisted to crush rock-soil mass on the tunnel face.
The opening rate of the cutter head 1 is set to be 43 percent, so that when a stratum with high content of sticky particles is encountered, slag can be effectively discharged, and mud and cutter mud cakes of the cutter head 1 are avoided; 6 foam nozzles 10 are arranged on the cutter head 1, so that a foaming agent can be added in real time according to the slag discharge condition and the properties of slag soil, the slag discharge effect is ensured through slag soil improvement, and the shield tunneling efficiency is improved; 1 wear monitoring knife 11 is arranged on the auxiliary knife beam and used for monitoring the wear of the knife tool in real time; wear-resisting steel plates 12 with the thickness of 10mm and 50mm are respectively arranged on the face plate and the periphery of the cutter head, and the effect of protecting the shield cutter head is achieved.
The shield cutter head suitable for the soft and hard composite stratum in the embodiment comprises the following steps of:
(1) and determining the soil layer distribution condition and the specific physical and mechanical property index in the process of the shield penetrating through the soft and hard composite stratum based on the specific geological survey data in the early stage of the engineering.
(2) The starting torque of the hob is determined according to the stratum crossing characteristics, particularly, the set value of the starting torque of the hob is not more than 20Nm in the process of excavating the sandy gravel stratum, and the set value of the starting torque of the hob is preferably within the range of 25-40Nm in the process of excavating the hard rock stratum such as argillaceous siltstone and the like.
(3) When the composite stratum with upper soft and lower hard exists in the crossing stratum, the hob starting torque of the soft soil stratum is selected and set.
(4) And starting a foam system, and spraying a foam modifier to the front of the cutter head through a foam nozzle.
(5) And starting the shield cutter head to rotate, starting the spiral conveyor and starting a propulsion mode, and enabling the shield to push forward the tunneling tunnel face rock-soil body.
The using effect of the embodiment is as follows:
in the construction process of a shield interval between a sand ditch station and a starting-phoenix road station on a No. 3 section of a subway in a certain city, earth pressure balance shield tunneling is adopted, and the cutterhead structure and the tunneling method are adopted. The shield machine realizes stable tunneling in a gravel-argillaceous siltstone composite stratum, the average tunneling speed reaches 470 rings/month, and the highest tunneling speed reaches 20 rings/day. During the tunneling process, the shield machine and the cutter head cutter are stopped for cutter changing once in plan, the cutter changing is cancelled in actual tunneling due to good working states of the shield machine and the cutter head cutter, the cutter head cutter is checked after the shield machine and the cutter head cutter are communicated, and the phenomena of cutter head paste, serious eccentric wear of the cutter and the like are avoided.
Claims (9)
1. A shield cutter head suitable for soft and hard composite strata comprises a shield cutter head, a cross main cutter beam, an auxiliary cutter beam, a central serrated cutter, a front hob, a cutter, an edge hob, an edge scraper, a fixed serrated cutter, a foam nozzle, an abrasion detection cutter, a wear-resistant steel plate and other TBM parts, and is characterized in that four Y-shaped auxiliary cutter beams are distributed on a diagonal line between the cross main cutter beams, and the cross main cutter beam and the auxiliary cutter beams form a load-bearing structure of the shield cutter head; the cross-shaped main cutter beam consists of a first cutter beam, a third cutter beam, a fifth cutter beam and a seventh cutter beam, and the auxiliary cutter beam consists of a second cutter beam, a fourth cutter beam, a sixth cutter beam and an eighth cutter beam; the central part of the cross-shaped main knife beam is provided with 8 central serrated knives side by side; 20 17-inch front-side hobs are mounted on the cross-shaped main cutter beam, and 5 hobs are uniformly mounted on each main cutter beam; cutters are respectively arranged in front of and behind the front hob rolling trace, and the number of the cutters is 56, and the cutters are distributed and installed on two sides of the cross-shaped main cutter beam; 6 foam nozzles are arranged on the cross-shaped main knife beam and the auxiliary knife beam; the auxiliary cutter beam is of a Y-shaped structure with a Y-shaped opening facing outwards, and 37 fixed tooth cutters and 7 17-inch edge hobs are arranged on the auxiliary cutter beam; the end part of the cross-shaped main cutter beam is provided with 8 pairs of edge scrapers with the cutter height of 145 mm; and a wear detection knife is arranged on the auxiliary knife beam.
2. The shield cutter head suitable for the soft and hard composite stratum according to claim 1, wherein the cutter height of the central toothed cutter is 175mm, and the cutter spacing is set to be 90 mm; the central serrated knife can effectively reduce the large torque of the conventional fishtail knife under the similar stratum conditions, thereby reducing the shield energy consumption and improving the tunneling efficiency.
3. The shield cutterhead suitable for use in soft and hard composite formations according to claim 1, wherein the face hob has a cutter height of 175mm and a cutter spacing of 100 mm; the front hob is a specially-made high-hardness columnar inserted hob.
4. The shield cutter head suitable for the soft and hard composite stratum according to claim 1, wherein the cutter height is 140mm, and the cutter spacing is 150 mm; the cutter rolls hard rock by a hob with the front embedded teeth and combines the comprehensive action of cutting soft soil by the cutter, so that the efficient tunneling of the shield in a soft and hard composite stratum is ensured; 56 cutters are arranged and distributed as follows: 24 cutters are arranged on the third cutter beam and the seventh cutter beam at equal intervals from inside to outside in the radial direction; the central parts of the first knife beam and the fifth knife beam are provided with the central toothed cutters, so that 4 cutters are arranged at equal intervals from inside to outside in the radial direction; the outer side 2 is closely arranged with 24 cutters; and respectively and symmetrically arranging 2 cutters in the center parts of the second cutter beam, the fourth cutter beam, the sixth cutter beam and the eighth cutter beam of the Y-shaped auxiliary cutter beam, wherein the total number of the cutters is 8.
5. The shield cutterhead suitable for soft and hard composite ground according to claim 1, wherein the fixed tooth cutters and the edge hob cutters are distributed on four secondary cutter beams;
fixed serrated knife symmetrical arrangement is in Y shape vice sword roof beam and blade disc edge, wherein: 7 fixed serrated cutters are symmetrically arranged on the second cutter beam and the sixth cutter beam respectively; the fourth knife beam and the eighth knife beam are provided with 2 foam nozzles and 1 abrasion detection knife, the fixed serrated knife at the position is cancelled, the rest positions are the same as the second knife beam and the fourth knife beam in arrangement, the fourth knife beam is provided with 6 fixed serrated knives, and the eighth knife beam is provided with 5 fixed serrated knives; the edge of the cutter head is provided with fixed serrated knives 12 at equal intervals; 37 fixed tooth cutters are arranged in total;
7 edge hobs are symmetrically arranged at the 4 auxiliary cutter beams close to the edge of the cutter head, wherein 2 hobs are symmetrically arranged at the second cutter beam, the sixth cutter beam and the eighth cutter beam respectively, and 1 hob is arranged at the fourth cutter beam; and the overcutting serrated knives are arranged at the symmetrical positions and are used for effectively controlling the overcutting amount of the soft and hard composite stratum.
6. The shield cutter head suitable for the soft and hard composite stratum according to claim 3, wherein the columnar inserted hob is composed of a columnar inserted hob and an alloy columnar gear; the columnar inserted hob is of a circular structure, and a plurality of alloy columnar teeth with the same height are uniformly inserted at the periphery of the outer edge of the columnar inserted hob.
7. The shield cutter head suitable for the soft and hard composite stratum according to claim 1, wherein the foam nozzles are installed and distributed as follows: 1 foam nozzle is respectively and symmetrically arranged at the two sides of a central serrated knife on a third knife beam 3 of the cross-shaped main knife beam, and 1 foam nozzle is arranged at the end part of the outer edge of the third knife beam; 1 foam nozzle is arranged on the fourth knife beam of the auxiliary knife beam, and 2 foam nozzles are arranged on the eighth knife beam.
8. The shield cutter head suitable for the soft and hard composite stratum according to claim 1, wherein the tunneling method of the shield cutter head suitable for the soft and hard composite stratum is as follows:
(1) determining the soil layer distribution condition and specific physical and mechanical property indexes in the process of the shield penetrating through the soft and hard composite stratum based on the specific engineering prophase geological survey data;
(2) determining the starting torque of the hob according to the stratum crossing characteristics, wherein the set value of the starting torque of the hob is not suitable to be larger than 20Nm in the process of excavating the sandy gravel stratum, and the set value of the starting torque of the hob is preferably within the range of 25-40Nm in the process of excavating the hard rock stratum such as argillaceous siltstone and the like;
(3) when a composite stratum with a soft upper part and a hard lower part exists in the penetrated stratum, selecting and setting the starting torque of a hob of the soft soil stratum;
(4) starting a foam system, and spraying a foam modifying agent to the front of the cutter head through a foam nozzle;
(5) and starting the shield cutter head to rotate, starting the spiral conveyor and starting a propulsion mode, and enabling the shield to push forward the tunneling tunnel face rock-soil body.
9. The shield cutter head suitable for the soft and hard composite stratum according to claim 1, wherein the physical and mechanical property indexes of the body comprise rock stratum saturated uniaxial compressive strength UCS, a rock integrity coefficient RQD value, a measured standard penetration average hammering number N of the sandy soil stratum, grain grading, sticky grain content, cohesive force c and important parameters of an internal friction angle phi.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110007563.3A CN112431601A (en) | 2021-01-05 | 2021-01-05 | Shield cutter head suitable for soft and hard composite stratum and tunneling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110007563.3A CN112431601A (en) | 2021-01-05 | 2021-01-05 | Shield cutter head suitable for soft and hard composite stratum and tunneling method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112431601A true CN112431601A (en) | 2021-03-02 |
Family
ID=74697157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110007563.3A Pending CN112431601A (en) | 2021-01-05 | 2021-01-05 | Shield cutter head suitable for soft and hard composite stratum and tunneling method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112431601A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113279774A (en) * | 2021-06-21 | 2021-08-20 | 中铁十二局集团有限公司 | Construction method for transition shield of limestone-soft soil layer without replacing soft soil cutter |
| CN113417651A (en) * | 2021-07-22 | 2021-09-21 | 华东交通大学 | Shield cutter head device for efficiently cutting reinforced concrete structure and working method |
| CN113863945A (en) * | 2021-11-03 | 2021-12-31 | 中铁华隧联合重型装备有限公司 | Three-mould heading machine with novel TBM (tunnel boring machine) heading mode |
| CN113863946A (en) * | 2021-09-09 | 2021-12-31 | 中建隧道建设有限公司 | Allocation method of shield cutter head tool penetrating inclined upper soft lower hard stratum |
| CN114352304A (en) * | 2022-01-12 | 2022-04-15 | 中国铁建重工集团股份有限公司 | Spherical cutter head |
| CN115355012A (en) * | 2022-08-11 | 2022-11-18 | 中交二公局第三工程有限公司 | Cutter head structure for preventing cutter head of shield tunneling machine from caking mud cake and using method thereof |
-
2021
- 2021-01-05 CN CN202110007563.3A patent/CN112431601A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113279774A (en) * | 2021-06-21 | 2021-08-20 | 中铁十二局集团有限公司 | Construction method for transition shield of limestone-soft soil layer without replacing soft soil cutter |
| CN113279774B (en) * | 2021-06-21 | 2023-06-20 | 中铁十二局集团有限公司 | Construction method for limestone-soft soil layer transition shield without replacing soft soil cutter |
| CN113417651A (en) * | 2021-07-22 | 2021-09-21 | 华东交通大学 | Shield cutter head device for efficiently cutting reinforced concrete structure and working method |
| CN113863946A (en) * | 2021-09-09 | 2021-12-31 | 中建隧道建设有限公司 | Allocation method of shield cutter head tool penetrating inclined upper soft lower hard stratum |
| CN113863946B (en) * | 2021-09-09 | 2023-04-25 | 中建隧道建设有限公司 | Blending method of shield cutter head cutter penetrating through inclined stratum with soft top and hard bottom |
| CN113863945A (en) * | 2021-11-03 | 2021-12-31 | 中铁华隧联合重型装备有限公司 | Three-mould heading machine with novel TBM (tunnel boring machine) heading mode |
| CN114352304A (en) * | 2022-01-12 | 2022-04-15 | 中国铁建重工集团股份有限公司 | Spherical cutter head |
| CN114352304B (en) * | 2022-01-12 | 2024-04-26 | 中国铁建重工集团股份有限公司 | Spherical cutter head |
| CN115355012A (en) * | 2022-08-11 | 2022-11-18 | 中交二公局第三工程有限公司 | Cutter head structure for preventing cutter head of shield tunneling machine from caking mud cake and using method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112431601A (en) | Shield cutter head suitable for soft and hard composite stratum and tunneling method | |
| Ma et al. | TBM tunneling in mixed-face ground: Problems and solutions | |
| CN102364049B (en) | Hard rock composite TBM (Tunnel Boring Machine) suitable for composite stratum and tunneling mode thereof | |
| CN202039854U (en) | Novel cutter disk of shield machine | |
| CN113704862B (en) | Shield optimization design method based on wedge coulter loosening and stripping sandy cobble stratum | |
| CN104775824B (en) | A kind of slurry shield main frame that can be used for upper-soft lower-hard ground | |
| CN114926101B (en) | Construction speed and safety-oriented TBM (Tunnel boring machine) adaptive surrounding rock grading method | |
| CN104060995A (en) | Shield cutterhead structure for uneven mutual-penetration composite rock stratum | |
| CN104100276A (en) | Uneven soft or hard mutual intrusion composite rock stratum shield cutterhead type selection and cutting tool configuration technology | |
| CN212359762U (en) | High-speed intelligent shield constructs machine | |
| CN104060996A (en) | Combined shield cutter disk for mutual intrusion composite rock strata with uneven hardness | |
| CN210564541U (en) | Quick heading machine | |
| CN204002808U (en) | A kind of shield cutter structure of invading mutually compound rock stratum for soft or hard inequality | |
| CN113417651B (en) | Shield cutter head device for efficiently cutting reinforced concrete structure and working method | |
| CN102041968A (en) | Large-diameter drill suitable for forming hole in mud cemented boulder-gravel formation | |
| CN204200241U (en) | A kind of soft or hard inequality invades shield cutter and the cutter type selection of compound rock stratum mutually | |
| CN214366069U (en) | Shield cutter head suitable for soft and hard composite stratum | |
| CN202882935U (en) | Dual-mode cutter disc suitable for construction of long-distance and big-gradient deviated well tunnel | |
| CN112709579A (en) | Quick-forming development machine for river and canal | |
| CN112523767A (en) | Construction method for shield pile grinding of expansion soil layer | |
| CN111058852A (en) | High-speed intelligent shield constructs machine | |
| CN109707394B (en) | Construction method for subway tunnel shield receiving end tunnel portal | |
| CN214196321U (en) | Soil pressure balance shield cutter head for water-rich round gravel stratum | |
| Chen et al. | Cutting, Wear and replacement of cutting tools during shield tunneling | |
| CN106493514B (en) | A kind of reproducing method of shield protection cutter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |